Symptoms
- Parking brake warning light flickers intermittently while driving
- Parking brake is confirmed fully released
- May correlate with bumps or rough roads
Likely causes
- CommonLoose or worn parking brake switchThe switch that detects the lever or pedal position can wear out and give an intermittent signal.
- CommonLow brake fluid intermittently triggering the shared warning lightOn many vehicles, this light doubles as a low-fluid warning and can flicker if the level is borderline and sloshing.
- PossibleLoose wiring connector near the parking brake mechanismVibration from road bumps can cause an intermittent connection.
- Less commonElectronic parking brake module glitchMore relevant on vehicles with a button-style electronic parking brake.
What to do
- Confirm the parking brake is fully and firmly released, not just partially.
- Check the brake fluid level, since a borderline-low level can cause intermittent flickering on shared-warning systems.
- Note if the flickering correlates with bumps or rough roads, suggesting a loose connection.
- Wiggle the parking brake lever or pedal gently (safely, while parked) to see if it affects the light.
- Have a mechanic inspect the parking brake switch and its wiring connector.
- Have the switch replaced if found to be worn or unreliable.
Tools and parts
Parking brake switchSearch: “parking brake switch for your car make and model”
When to call a pro
See a mechanic if the flickering continues after confirming fluid is full and the parking brake is fully released, since the switch likely needs replacement.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.